J1 connector pinout

J2 connector pinout

It's for most Mac Pros, the problem with the power supplies is that you have to match part of the serial number as well as the part number.

Part number is usually: XXX-XXXX
The serial number is: XXXXXXXXEEEX. The last 3 of 4 letters or numbers is the version number of the PSU. This must match or they don't always work (thanks Apple). It's called the EEE code.